Pump

ABSTRACT

A pump for boosting and transporting a liquid, includes a housing, a gear rotor device, at least one cover and a motor. A transportation chamber is defined in the housing. An inlet and an outlet are defined in the housing and respectively in communication with the transportation chamber. The gear rotor device is received in the transportation chamber. The gear rotor device includes first and second gears meshing with each other. The at least one cover covers and seals at least one side of the housing. The motor is mounted on one cover with a shaft thereof rotatably connecting with one of the first and second gears. Through a full compression by the gear rotor device, the liquid transportation is in a positive displacement and the liquid is pressurized by the gear rotor device whereby the pump has high head and therefore efficiently transports the liquid.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a pump, particularly to a pump whichhas high head, is not limited to be mounted beneath a liquid surface forstarting, is applied for drain of condensed water of an air-cooler,spray for heat dissipation of a condenser, spouting of a windshieldwiper of a car, headlight cleanout, spray of gardening watering and soon, and achieves a positive transportation result.

2. Prior Art

In general, many implements are equipped with pumps for aiding totransport a liquid to a predetermined place. For example, when condensedwater of an air-cooler cannot be drained due to the mounted positionlimitation of the outlet for the condensed water, a pump is installedadditionally as a relay station to draw the condensed water to apredetermined place. As another example, a liquid for a windshield wiperof a car is drawn to a windshield of the car by a pump too. As anotherexample, a pump is used in spray and irrigation for gardening flowersand grass. As described above, pumps are widely applied.

However, the conventional pump is centrifugal type with low head.Furthermore, a net positive suction head (NPSH) problem has to beconsidered when the pump is installed. That's, the inlet of theconventional centrifugal pump must locate below a liquid surface in aproper depth. Otherwise, cavitation will occur, which results that thefunction of transporting is adversely affected or even lapsed. Thus, itis inconvenient to install the conventional pump.

SUMMARY OF THE INVENTION

Accordingly, an object of the present invention is to provide a pump,which has high head and is convenient to be installed with an inletthereof being above or beneath a liquid surface.

Further object of the present invention is to provide a pump preventingcavitation from a high-speed rotation.

Further object of the present invention is to provide a pump, which isapplied to an air-cooler with a nozzle for spraying the condenser of theair-cooler thereby, increasing heat transfer efficiency.

To achieve the above-mentioned objects, a pump of the present inventioncharacterizes in that a gear rotor device received in a transportationchamber. The gear rotor device includes first and second gears meshingwith each other. Through a full compression by the gear rotor device,the liquid transportation is in positive displacement and the liquid ispressurized by the gear rotor device whereby the pump has high head andtherefore efficiently transports the liquid.

Wherein the meshing first and second gears are spur gears or helicalgears.

According to one aspect of the present invention, the transportationchamber has two cavities with different diameters and in communicationwith each other, that's, diameters of pitch circles of the meshing firstand second gears are different, thereby increasing a transportation rateof the liquid and a rotation speed of the other gear.

According to another aspect of the present invention, the transportationchamber has two cavities with same diameters.

Wherein an inlet is connected with a side wall of the transportationchamber which is formed along a beeline between two points of tangenciesof the largest meshing rotor circles of the first and second gears,whereby the liquid is drawn smoothly during the meshing rotation of thefirst and second gears for preventing from incompletely suction therebypreventing cavitation.

According to another aspect of the present invention, the inlet and theoutlet are mounted with different arrangements by axis and longitude onthe transportation chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a pump of the present invention;

FIG. 2 is a crosssectional view of a transportation chamber of thepresent invention;

FIG. 3 is a crosssectional view along line 3-3 in FIG. 1;

FIG. 4 is a perspective view showing the pump being applied to a windowtype air-cooler;

FIGS. 5 and 6 are schematic views showing the pump being applied to aseparation type air-cooler;

FIG. 7 is a schematic view showing a pump in accordance with the secondembodiment of the present invention;

FIG. 8 is a schematic view showing a pump in accordance with the thirdembodiment of the present invention; and

FIGS. 9A-9D are schematic views showing different arrangements of aninlet and an outlet.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1-3, a pump 1 of the present invention includes ahousing 2, a gear rotor device 3, first and second covers 40, 41 and amotor 5. A transportation chamber 20 is defined through the housing 2for receiving the gear rotor device 3. In this embodiment, thetransportation chamber 20 has two cavities with different diameters andin communication with each other. That's, diameters of pitch circles ofmeshing gears of the gear rotor device 3 are different. Therefore, atransportation rate of liquid is increased and a rotate speed of thegear rotor device 3 is increased too. Referring to FIG. 3, the gearrotor device 3 includes a first gear 30 and a second gear 31. Themeshing first and second gears 30, 31 are spur gears or heelical gears.The first gear 30 rotatably connects with the motor 5 and has arelatively large diameter and a relatively great amount of gear teeth301. The first gear 30 drives the second gear 31 as a gearwheel drives apinion. So the rotate speed of the gear rotor device 3 in thetransportation chamber 20 is increased and the transportation rate ofliquid is increased too. An inlet 201 and an outlet 202 are defined inthe housing 2 and respectively in communication with the transportationchamber 20. In this embodiment, the inlet 201 and the outlet 202 areconfigured in a line and at opposite sides of the transportation chamber20.

The first and second covers 40, 41 respectively cover upper and lowersides of the housing 2 thereby sealing the transportation chamber 20 andpositioning the first and second gears 30, 31 within the transportationchamber 20. The motor 5 is mounted on the first cover 40 with a shaft(not shown) thereof rotatably connecting with the first gear 30. Whenthe motor 5 is actuated, the motor 5 drives the first gear 30 to rotateand then drives the second gear 31 to rotate. Therefore, when the firstand second gears 30, 31 mesh with each other to rotate in reversedirections, the liquid will be drawn from the inlet 201 to thetransportation chamber 20 through the suction zone 21 defined betweenthe first and second gears 30, 31, and then compressed by the meshingfirst and second gears 30, 31, and then expelled from the outlet 202along the rotation directions of the first and second gears 30, 31.Since the first gear 30 meshes with the second gear 31 and drives thesecond gear 31 to rotate, the rotation is smooth and so thetransportation is in a positive volume manner. Thus, a full compressionis achieved in the pump 1 and so the pump 1 has high head and cavitationdoes not occur. Therefore, it is unnecessary to consider the NPSHproblem and so it is easy to install the pump 1.

Referring to FIG. 4, the pump 1 of the present invention is applied to awindow type air-cooler 7. The pump 1 (as shown in broken line) ismounted between an evaporator 70 and a condensator 71 of the window typeair-cooler 7. When the motor 5 of the pump 1 is actuated, a condensedliquid of the evaporator 70 is drawn from the inlet 201 to thetransportation chamber 20 through a tube 23 connected between the inlet201 and the transportation chamber 20. Another tube 23 is connected withthe outlet 202 with a nozzle 24 connected with the other end thereof forspraying the condensator 71, thereby increasing efficiency of heatdissipation of the window type air-cooler 7.

Referring to FIGS. 5 and 6, the pump 1 is applied to a separation typeair-cooler 6. The pump 1 is mounted at a side of the air-cooler 6 awayfrom a control PCB assembly 60 (see FIG. 5), or is mounted at a side ofthe air-cooler 6 close the control PCB assembly 60 (see FIG. 6).Therefore, when the motor 5 of the pump 1 is actuated, a condensedliquid of an evaporator (not shown) of the air-cooler 6 is drawn fromthe inlet 201 to the transportation chamber 20 and then expelled fromthe outlet 202 to a predetermined place through a tube 23 connected withthe outlet 202. Thus, since the pump 1 has high head, the pump 1 iscapable to be directly installed in the interior of the separation typeair-cooler 6. So, it is convenient to install the pump 1 and theseparation type air-cooler 6.

The pump 1 of the present invention is capable to smoothly transport theliquid under a high rotation speed, since the transportation is positivedisplacement. Furthermore, the pump 1 has high head and cavitation doesnot occur under the high rotation speed. Therefore, besides theair-cooler, the pump 1 may be applied to other implements needing topressurizingly transport the liquid, such as spouting of a rain brush ofa car, headlight cleanout, spray of gardening watering and so on.

FIGS. 7 and 8 show pumps 1′ in accordance with the second and thirdembodiments of the present invention. A transportation chamber 20′ isdefined in each pump 1′ and has two cavities with same diameters, whichis different from the first embodiment. So, diameters of pitch circlesof meshing first and second gears 30′, 31′ are the same. As shown inFIG. 7, an inlet 201′ is connected with a side wall of thetransportation chamber 20′ which is formed along a beeline between twopoints P, Q of tangencies of the largest meshing rotor circles of thefirst and second gears 30′, 31′. Thus, the liquid is drawn smoothlyduring the meshing rotation of the first and second gears 30′, 31′. Therotation path to draw liquid is increased for preventing fromincompletely drawing the liquid thereby preventing the cavitation.Furthermore, it is prevented from incompletely suction during thehigh-speed transportation, thereby preventing the cavitation.

Referring to FIGS. 9A-9D, the pump 1″ has an inlet 201″ and an outlet202″ which are formed with different arrangements by axis and longitudeon the transportation chamber. The pump 1″ can also achieve the objectsof the present invention since it has the above-mentioned advantages ofthe present invention.

It is understood that the invention may be embodied in other formswithout departing from the spirit thereof. Thus, the present examplesand embodiments are to be considered in all respects as illustrative andnot restrictive, and the invention is not to be limited to the detailsgiven herein.

1. A pump for boosting and transporting a liquid, comprising: a housing,transportation chamber being defined in the housing, an inlet and anoutlet being defined in the housing and respectively in communicationwith the transportation chamber; a gear rotor device received in thetransportation chamber, the gear rotor device comprising first andsecond gears meshing with each other; at least one cover covering andsealing at least one side of the housing; and a motor mounted on onecover with a shaft thereof rotatably connecting with one of the firstand second gears; Wherein through a full compression by the gear rotordevice, the liquid transportation is in positive displacement and theliquid is pressurized by the gear rotor device whereby the pump has highhead and therefore efficiently transports the liquid.
 2. The pump asclaimed in claim 1, wherein the meshing first and second gears are spurgears or helical gears.
 3. The pump as claimed in claim 1, wherein thetransportation chamber has two cavities with same diameters.
 4. The pumpas claimed in claim 3, wherein the inlet is connected with a side wallof the transportation chamber which is formed along a beeline betweentwo points of tangencies of the largest meshing rotor circles of thefirst and second gears, whereby the liquid is drawn smoothly during themeshing rotation of the first and second gears for preventing fromincompletely suction thereby preventing cavitation.
 5. The pump asclaimed in claim 1, wherein the transportation chamber has two cavitieswith different diameters and in communication with each other, that's,diameters of pitch circles of the meshing gears are different, the gearrotatably connecting with the motor has a relatively large diameter anda relatively great amount of gear teeth and drives the other gear as agearwheel drives a pinion thereby increasing a transportation rate ofthe liquid and a rotation speed of the other gear.
 6. The pump asclaimed in claim 5, wherein the inlet and the outlet are mounted withdifferent arrangements by axis and longitude on the transportationchamber.
 7. The pump as claimed in claim 6, wherein a nozzle is furtherconnected with the outlet for providing a spraying function.
 8. The pumpas claimed in claim 7, wherein the transportation chamber is definedthrough the housing, first and second covers respectively cover upperand lower sides of the housing thereby sealing the transportationchamber and positioning the first and second gears within thetransportation chamber.